Knife sharpener



FIG. 1 is a perspective view of a knife sharpener showing my new design;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an enlarged view of portion 9 circumscribed within FIG. 1 .

The broken lines depict portions of the knife sharpener in which thedesign is embodied that are not considered part of the claimed design.

CLAIM The ornamental design for a knife sharpener, as shown anddescribed.